function fnSum(iNum1, iNum2) {
    var iResult = iNum1 + iNum2;
    iResult++;
    console.log("iResult: " + iResult)
    return iResult;
}

console.log(fnSum(1, 2));


var iNum = 10, sStr = '10';
if (iNum === sStr) {
    console.log('条件成立');
} else {
    console.log('条件不成立')
}

function fnShow(fScore) {
    if (fScore < 60) {
        console.log('不及格');
    } else if (fScore < 70) {
        console.log('及格')
    } else if (fScore < 80) {
        console.log('中等')
    } else if (fScore < 90) {
        console.log('良好')
    } else {
        console.log('优秀')
    }
}

fnShow(90)
